Pump



FIG. 1 is an isometric view of a pump showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a plan view thereof; and,

FIG. 6 is an inverted plan view.

The ornamental design for a pump, substantially as shown and described.